关于push，近期小米推送将上线订阅消息功能，原私信通道下的个人订阅类目将统一调整至公信消息。仅接入小米个人订阅消息的 App 开发者需关注，未使用无需处理。

1、订阅类消息仅支持使用 8 个专属订阅类目，规则详见小米推送2026年消息分类新规：https://dev.mi.com/xiaomihyperos/documentation/detail?pId=2321

2、2026年8月1日起原有私信渠道下的【个人订阅】通道将关闭申请入口，于2026年12月31日正式关停使用。

3、2026年8月1日之前已申请接入过【个人订阅】分类的应用，需要在2026年12月31日前完成订阅消息功能接入和订阅授权弹窗适配。具体接入流程请参考：https://dev.mi.com/xiaomihyperos/documentation/detail?pId=2320

4、2026年8月1日之后新申请订阅分类的需要按照新规接入发送

对接个推侧需要进行以下适配：
1、服务端：接入订阅类消息后推送提醒方式与私信消息相同，新订阅消息的channel_id与原有【个人订阅】分类的channel_id不同，在调用个推服务推送API下发订阅类消息时，必须同时设置小米消息分类和私信模板相关参数，接口设置参照文档【小米】私信模板id：https://docs.getui.com/getui/server/rest_v2/third_party/#doc-title-15
2、客户端：

• Android小米厂商SDK 需要升级到 com.getui.opt:xmp:3.3.7 版本
• 客户端需完成订阅消息功能接入，同步适配订阅授权弹窗，统一采用系统原生 API 调用实现，完整接入规范可参考小米推送订阅消息官方文档：https://dev.mi.com/xiaomihyperos/documentation/detail?pId=2320

以上请尽快完成适配，根据应用业务场景，发送不同类别的消息。如有疑问，可以添加微信客服群进行咨询，加群方式参考文档：https://uniapp.dcloud.net.cn/unipush-v2.html#%E5%B8%B8%E8%A7%81%E9%97%AE%E9%A2%98

'''BeeWare 走的是和 Flet 不一样的路子：它的 Toga 用的是各平台的原生控件，iOS 上就是真的 UIKit，不套 Flutter 或者 WebView。打包工具叫 Briefcase，briefcase create iOS 会生成一个 Xcode 工程，briefcase build iOS 编译，briefcase package iOS 出包。

因为最终还是 Xcode 在干活，这几条命令都得在 macOS 上跑。Windows 上 Briefcase 只能处理 Windows/Android 那些目标。这一步没有变通。

我的分工是：Python 代码在 Windows 上写，iOS 出包丢给 macOS 机器；证书、描述文件、IPA 上传用开心上架（AppUploader）在 Windows 上处理。

先说结论：哪一步真绕不开 Mac

说明一下：我用的签证书工具本身在 macOS 上也能用（网页版不挑系统，桌面客户端有 macOS 版）。表里"不需要 Mac"是指这一步不再需要 Xcode、钥匙串访问或 Transporter。

第一步：在 pyproject.toml 里定好 bundle

Briefcase 的配置全在 pyproject.toml 里。iOS 的包标识由 bundle 加 app 名拼出来：

[tool.briefcase]  
project_name = "My App"  
bundle = "com.yourcompany"  
version = "1.0.0"  

[tool.briefcase.app.myapp]  
formal_name = "My App"

这样最终的 Bundle Identifier 就是 com.yourcompany.myapp。拼出来的这个值要和 Apple 注册的 Bundle ID、描述文件绑定的 App ID 完全一致——注意是拼出来的结果，不是 bundle 字段本身，这点第一次配的时候容易搞错。

第二步：在 Windows 上签出证书和描述文件

注册 Bundle ID：开心上架的「Bundle ID」页面点「新建 Bundle ID」，Identifier 填拼出来的那个完整标识。创建后改不了，所以先把 bundle 和 app 名定下来再注册。

签发证书：「证书」页面点「新建证书」，上架选发布签名证书，真机调试选开发签名证书。绑定上面的 Bundle ID，填名称邮箱，设一个 .p12 保护密码——导入 Mac 钥匙串时要输，服务器不保存它，忘了只能吊销重签。勾上「使用开心上架服务同步证书」的话，出包用的那台 Mac 直接登录下载就行。

生成描述文件：「描述文件」页面点「新建描述文件」，上架选 App Store 类型，内测选 Ad Hoc 并勾上测试设备，关联上面的 Bundle ID 和证书，提交后下载 .mobileprovision。

私钥和 CSR 都在你本机生成后封进 .p12，不用在 Mac 上走「钥匙串访问 → 从证书颁发机构请求证书」那一套——对只写 Python、平时压根不碰 Xcode 的人来说，这一步省下来挺值的。

第三步：在 macOS 上导入签名材料

security import dist.p12 -k ~/Library/Keychains/login.keychain-db -P "你的p12密码" -T /usr/bin/codesign  

mkdir -p ~/Library/MobileDevice/Provisioning\ Profiles  
cp AppStore.mobileprovision ~/Library/MobileDevice/Provisioning\ Profiles/

第四步：生成工程、编译、出包

在 macOS 上依次跑：

briefcase create iOS  
briefcase build iOS  
briefcase package iOS

briefcase create iOS 会在 build/ 下生成一个 Xcode 工程。package 这一步会做签名，Briefcase 会让你选用哪个签名身份（identity），也可以用参数直接指定，具体参数名以 briefcase package iOS --help 输出的为准——Briefcase 各版本的命令行选项变动比较频繁。

签名这块有个实操建议：别让 Xcode 自动管理签名。生成的工程里如果开着 Automatically manage signing，Xcode 会跑去 Apple 那边替你申请新证书，而同类型证书一共就 3 个名额，几轮下来会占满。用 Xcode 打开生成的工程，把它关掉，手动选第二步那套证书和描述文件，再回来跑 briefcase package iOS。

改了 pyproject.toml 里跟原生工程相关的配置之后，记得重新 briefcase create iOS（或者带 -r 更新），不然生成的工程里还是旧配置。

第五步：把 IPA 传上去

拿到包之后就跟 Mac 无关了。我一般先在开心上架的「文件&提交」页面把 IPA 打开看一眼签名信息——Bundle ID 是不是拼出来的那个、描述文件类型对不对、证书有没有过期，确认了再点「提交 App Store」。

命令行版本，在 Windows 上直接跑：

appuploader-cli upload -f MyApp.ipa -u dev@example.com -p abcd-efgh-ijkl-mnop

-p 是 Apple 生成的 App 专用密码（xxxx-xxxx-xxxx-xxxx），不是 Apple ID 登录密码。也可以用 API 密钥：

appuploader-cli upload -f MyApp.ipa --api-key <KeyID> --api-issuer <IssuerID> --private-key Auth_Key.p8

密钥方式只收 .ipa，且 App 要先在 App Store Connect 里建好。

第六步：发内测包

「设备」页面点「注册设备」，二维码发出去让人扫上报 UDID（一年 100 台，免费账号 3 台）。回描述文件那边点「重建」，生成一份包含这些设备的 Ad Hoc 描述文件，拷到 Mac 上替换掉旧的。

重新 package 一次，然后在「文件&提交」页面生成二维码让人扫码装。

写在最后

BeeWare 这条路对纯 Python 背景的人最友好的地方，是你几乎不用学 Objective-C 或 Swift。但签名这一环是躲不掉的 Apple 规则，和你用什么语言无关——把证书和描述文件在 Windows 上准备好，Mac 那边就只剩三条 briefcase 命令。'''

问题现象
如何让Canvas绘制内容能超出父组件的限制，“按下”的响应区域不超出父组件范围？组件中.clip属性能实现此效果吗？

背景知识
HarmonyOS组件中.clip属性：是否对子组件超出当前组件范围外的区域进行裁剪。参考链接：clip。
HarmonyOS组件中.responseRegion属性可以实现组件的响应区域范围的变化，响应区域范围可以超出或者小于组件的布局范围。参考链接：自定义控制的多层级手势事件。
Canvas：Canvas组件提供画布，用于自定义绘制图形。
CanvasRenderingContext2D：使用CanvasRenderingContext2D在Canvas画布组件上进行绘制，绘制对象可以是矩形、文本、图片等。
解决方案
在HarmonyOS中，无法通过.clip属性实现所需效果。当.clip属性设置为true时，子组件超出当前组件范围的区域将不会响应绑定的手势事件；当设置为undefined时，系统将不再对超出部分进行裁剪，但这并不意味着可以控制内容超出组件本身的绘制范围。可以通过以下方案实现让Canvas绘制内容能超出父组件限制的功能，步骤如下：

使用Column父组件包含子组件Canvas，Column父组件宽高为(150,150)区域，子组件Canvas宽高为(300,300)。
对Canvas组件设置.responseRegion属性触摸热区为.responseRegion({ x: 75, y: 0, width: 150, height: 150 })。实现功能：蓝色区域（150150）可响应Canvas绘制内容时“按下（down）”的触摸操作，红色区域（300300去除蓝色区域的范围）不可响应“按下（down）”的触摸操作，红色区域只可响应从蓝色区域“按下（down）”后的“移动（move）”触摸操作。
说明
当组件Canvas绑定了.responseRegion(Rect)，所有落在Rect区域范围的触摸事件和手势可被组件Canvas对应的回调响应。

@Entry
@Component
struct DrawBankCom {
paintSize: number = 5; // 当前画笔大小
private settings: RenderingContextSettings = new RenderingContextSettings(true);
canvasContext: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings);
tempPath: Path2D = new Path2D();
@State @Watch('onChange') pathArray: Array<Path2D> = []; // 所有画图路径信息
isUpdate: boolean = true;
removeArray: Array<Path2D> = []; // 回退的路径集合
@State text: string = '';
@State eventType: string = '';

build() {
Column() {
if (this.isUpdate) {
Row() {
Column() {
Canvas(this.canvasContext)
// Canvas(子组件)宽高设置为300300
.width(300)
.height(300)
.onReady(() => {
this.canvasContext.lineWidth = this.paintSize;
this.canvasContext.stroke(this.tempPath);
for (let index = 0; index < this.pathArray.length; index++) {
this.canvasContext.stroke(this.pathArray[index]);
}
})
.onTouch((event?: TouchEvent) => {
if (event) {
if (event.type === TouchType.Down) {
this.eventType = 'Down';
this.canvasContext.lineWidth = this.paintSize;
this.canvasContext.beginPath();
this.tempPath = new Path2D();
this.pathArray.push(this.tempPath);
this.tempPath.moveTo(event.touches[0].x, event.touches[0].y);
this.canvasContext.moveTo(event.touches[0].x, event.touches[0].y);
}
if (event.type === TouchType.Up) {
this.eventType = 'Up';
}
if (event.type === TouchType.Move) {
this.eventType = 'Move';
this.tempPath.lineTo(event.touches[0].x, event.touches[0].y);
this.canvasContext.stroke(this.tempPath);
this.canvasContext.lineTo(event.touches[0].x, event.touches[0].y);
this.canvasContext.stroke();
}
this.text = 'TouchType:' + this.eventType + '\n touch point and touch element:\nx: ' +
event.touches[0].x + '\n' + 'y: ' + event.touches[0].y + '\nwidth:' +
event.target.area.width + '\nheight:' + event.target.area.height + '\pathArray size:' +
this.pathArray.length;
}
})
.renderFit(RenderFit.TOP_RIGHT)
// 设置触摸热区，蓝色区域可响应“down”操作，红色不可响应“down”操作，只能响应“move”操作
.responseRegion({
x: 75,
y: 0,
width: 150,
height: 150
});
}
// Column(父组件)宽高设置为150150
.width(150)
.height(150)
.backgroundColor('#ffbdf3e9');
};
}

  Column() {  
    Row() {  
      Button('回退').onClick(() => {  
        this.pathArray.pop();  
      });  
    };  

    Text(this.text);  
  };  
}  
.width(300)  
.height(300)  
.clip(false)  
.borderRadius(10)  
.backgroundColor('#ff0000');  

}

onChange() {
this.canvasContext.reset();
this.canvasContext.lineWidth = this.paintSize;
for (let index = 0; index < this.pathArray.length; index++) {
this.canvasContext.stroke(this.pathArray[index]);
}
}
}
具体表现为从蓝色区域开始画线，可以延伸到红色区域，但是不可从红色区域开始画线。

总结
使用.responseRegion属性可以实现组件的响应区域范围的变化，能实现让Canvas绘制内容能超出父组件的限制。
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JavaScript this 指南

一、核心心法

this 不是在函数定义时确定的,而是在函数被调用时确定的。
判断 this,只需要看一件事:这个函数是怎么被调用的(调用点)。

唯一的例外是箭头函数——它根本没有自己的 this。

二、五种绑定规则

规则 1:默认绑定(独立函数调用)

function foo() {  
  console.log(this);  
}  

foo();  // 非严格模式: globalThis (浏览器 window / Node global)  
        // 严格模式:   undefined

'use strict';  
function foo() { console.log(this); }  
foo();  // undefined

顶层 this 的值取决于环境:

规则 2:隐式绑定(方法调用)

看调用时最后一个点前面是谁。

const obj = {  
  name: 'obj',  
  foo() { console.log(this.name); }  
};  

obj.foo();  // 'obj'

多层嵌套只看最后一层:

const a = { name: 'a', b: { name: 'b', foo() { console.log(this.name); } } };  
a.b.foo();  // 'b'  ← 不是 'a'

方括号访问同理:

a.b['foo']();  // 'b'

规则 3:显式绑定(call / apply / bind)

function greet(greeting, punct) {  
  console.log(greeting + ', ' + this.name + punct);  
}  
const me = { name: 'Alice' };  

greet.call(me, 'Hi', '!');       // 逐个传参  
greet.apply(me, ['Hi', '!']);    // 数组传参 (Apply → Array)  
const bound = greet.bind(me, 'Hi');  // 返回新函数 + 支持柯里化  
bound('!');

bind 的三个特性:

1. 返回一个新函数,不立即执行
2. 支持参数预置(柯里化)
3. 硬绑定:绑定后无法再被 call/apply 改变

const hard = greet.bind(me);  
hard.call({ name: 'Bob' }, 'Yo', '!');  // 依然是 Alice

传 null / undefined 的坑:

function foo() { console.log(this); }  
foo.call(null);  // 非严格: globalThis(被替换了!)  严格: null

安全做法——DMZ 空对象:

const DMZ = Object.create(null);   // 比 {} 更干净,无原型  
foo.apply(DMZ, [1, 2]);

原始值会被装箱(仅非严格模式):

function f() { console.log(typeof this); }  
f.call(1);              // 'object'  (Number 包装对象)  
// 严格模式下: 'number'

规则 4:new 绑定

new Foo() 做了四件事:

1. 创建一个新的空对象
2. 将该对象的 [[Prototype]] 指向 Foo.prototype
3. 以该对象为 this 执行 Foo
4. 如果 Foo 没有返回一个对象,则返回这个新对象

function Person(name) {  
  this.name = name;  
  // return { name: 'hacked' };  // 若返回对象,则 new 的结果是它  
  // return 42;                  // 返回原始值 → 被忽略,仍返回 this  
}  
const p = new Person('Alice');  // p.name === 'Alice'

规则 5:箭头函数(词法绑定)

箭头函数没有自己的 this,它继承定义时所在外层作用域的 this,且永久不可改变。

const obj = {  
  name: 'obj',  
  regular() {  
    const arrow = () => console.log(this.name);  
    arrow();  // 'obj'  ← 继承 regular 的 this  
  },  
  arrowMethod: () => console.log(this?.name)  // ⚠️ 继承的是模块/全局的 this  
};  

obj.regular();      // 'obj'  
obj.arrowMethod();  // undefined  ← 经典陷阱!

箭头函数无法被改变:

const arrow = () => console.log(this);  
arrow.call({ a: 1 });   // call 无效  
arrow.bind({ a: 1 })(); // bind 无效  
new arrow();            // TypeError: arrow is not a constructor

箭头函数也没有 arguments、super、new.target。

三、优先级

new 绑定  >  显式绑定(bind/call/apply)  >  隐式绑定(obj.fn)  >  默认绑定

箭头函数不在此列——它压根不参与,直接看词法作用域。

验证 new > bind:

function Foo(a) { this.a = a; }  
const obj = {};  
const B = Foo.bind(obj);  

B(2);              // obj.a === 2      (bind 生效)  
const b = new B(3);// b.a === 3, obj.a 仍是 2   ← new 赢了

这正是 bind polyfill 里必须判断 new.target 的原因。

四、隐式丢失:最常见的 Bug 来源

1. 赋值给变量

const obj = { name: 'obj', foo() { console.log(this?.name); } };  
const fn = obj.foo;   // 只拿到了函数引用,丢掉了 obj  
fn();                 // undefined

2. 作为回调传递

setTimeout(obj.foo, 100);        // 丢失  
[1].forEach(obj.foo);            // 丢失  
btn.addEventListener('click', obj.foo);  // this 变成 btn

3. 解构

const { foo } = obj;  
foo();  // 丢失

这就是 React 中 const { setState } = this 会出问题、
以及 Vue3 用 ref 而非 this 的部分原因。

4. 间接引用

const o1 = { name: 'o1', foo() { console.log(this.name); } };  
const o2 = { name: 'o2' };  

o2.foo = o1.foo;  
o2.foo();          // 'o2'  (正常隐式绑定)  

(o2.foo = o1.foo)();  // 赋值表达式返回函数本身 → 默认绑定 → undefined/报错

5. 解决方案汇总

// ① bind  
setTimeout(obj.foo.bind(obj), 100);  

// ② 箭头函数包裹(推荐,可读性好)  
setTimeout(() => obj.foo(), 100);  

// ③ 数组方法的 thisArg 参数  
[1, 2].forEach(obj.foo, obj);  

// ④ class field 箭头函数(见下文)

支持 thisArg 的数组方法:
forEach map filter some every find findIndex findLast findLastIndex flatMap

不支持的: reduce reduceRight sort(它们的第二参数另有用途)

五、Class 中的 this

类体内永远是严格模式

class Counter {  
  count = 0;  

  inc() { this.count++; }               // 原型方法 → this 会丢失  
  dec = () => { this.count--; };        // 类字段箭头函数 → this 永久绑定实例  
}  

const c = new Counter();  
const { inc, dec } = c;  
dec();   // ✅ 正常  
inc();   // ❌ TypeError: Cannot read properties of undefined

两者的本质区别:

推荐做法: 默认用原型方法,只在需要作为回调传递时用箭头字段,或在构造器中 bind:

class Counter {  
  constructor() {  
    this.inc = this.inc.bind(this);  // 等价效果  
  }  
}

静态方法中的 this

class A {  
  static create() { return new this(); }  // this === 类本身,支持子类继承  
}  
class B extends A {}  
B.create();  // 返回 B 的实例,而非 A

继承与 super

class Base {  
  constructor() { this.type = 'base'; }  
  hello() { console.log('base hello'); }  
}  
class Child extends Base {  
  constructor() {  
    // console.log(this);  // ❌ ReferenceError: 必须先调用 super()  
    super();               // 派生类中,super() 之前 this 处于 TDZ  
    console.log(this.type);// 'base'  
  }  
  hello() {  
    super.hello();         // super 方法调用时,this 仍是当前实例  
  }  
}

私有字段的坑

class A {  
  #secret = 1;  
  get() { return this.#secret; }  
}  
const a = new A();  
a.get.call({});  // TypeError: Cannot read private member #secret  
                 // 私有字段是"品牌检查",this 必须是真实实例

六、各类场景速查

DOM 事件

btn.addEventListener('click', function () {  
  console.log(this);  // === event.currentTarget (btn)  
});  

btn.addEventListener('click', () => {  
  console.log(this);  // 外层作用域的 this,不是 btn  
});

handleEvent 特殊接口(传对象而非函数):

const handler = {  
  count: 0,  
  handleEvent(e) { console.log(this.count++, e.type); }  // this === handler  
};  
btn.addEventListener('click', handler);

内联 onclick="..." 属性中的 this 也是元素本身。

定时器

setTimeout(function () {  
  console.log(this);  
  // 浏览器非严格: window  
  // Node:         Timeout 对象  
}, 0);

getter / setter

const obj = {  
  _v: 1,  
  get v() { return this._v; }   // this 是访问该属性的对象  
};

Proxy 中的 this 泄漏

const target = { greet() { return this; } };  
const proxy = new Proxy(target, {});  
proxy.greet() === proxy;  // true —— this 是 proxy,不是 target  
// 若 target 用了私有字段或内部槽(如 Map/Set),会报错

标签模板 / 生成器 / async

async function f() { return this; }   // 与普通函数规则一致  
function* g() { yield this; }         // 同上

七、手写实现(面试高频)

Function.prototype.myCall = function (context, ...args) {  
  if (typeof this !== 'function') throw new TypeError('not a function');  
  context = context ?? globalThis;  
  if (Object(context) !== context) context = Object(context);  // 原始值装箱  

  const key = Symbol('fn');       // Symbol 避免属性名冲突  
  context[key] = this;  
  try {  
    return context[key](...args);  
  } finally {  
    delete context[key];  
  }  
};  

Function.prototype.myApply = function (context, args = []) {  
  return this.myCall(context, ...args);  
};  

Function.prototype.myBind = function (context, ...preArgs) {  
  const fn = this;  
  if (typeof fn !== 'function') throw new TypeError('not a function');  

  function bound(...args) {  
    // 关键:new 调用时忽略 context,使用新建的 this  
    return fn.apply(  
      new.target ? this : context,  
      [...preArgs, ...args]  
    );  
  }  
  // 维持原型链,使 instanceof 正确  
  bound.prototype = Object.create(fn.prototype || null);  
  return bound;  
};

// 手写 new  
function myNew(Ctor, ...args) {  
  const obj = Object.create(Ctor.prototype);  
  const ret = Ctor.apply(obj, args);  
  return (ret !== null && (typeof ret === 'object' || typeof ret === 'function'))  
    ? ret  
    : obj;  
}

八、综合练习(先自己作答)

var name = 'global';   // 注意:必须是 var,let/const 不挂载到 window  

const obj = {  
  name: 'obj',  
  f1() { console.log(this.name); },  
  f2: () => console.log(this?.name),  
  f3() {  
    return function () { console.log(this?.name); };  
  },  
  f4() {  
    return () => console.log(this.name);  
  }  
};  

obj.f1();          // ?  
obj.f2();          // ?  
obj.f3()();        // ?  
obj.f4()();        // ?  
const g = obj.f1;  
g();               // ?  
obj.f1.call({ name: 'x' });  // ?  
new obj.f1();      // ?

答案

obj.f1()          → 'obj'        隐式绑定  
obj.f2()          → 'global'/undefined  箭头函数继承顶层 this  
obj.f3()()        → 'global'/undefined  返回的函数独立调用,默认绑定  
obj.f4()()        → 'obj'        箭头函数继承 f4 的 this  
g()               → 'global'/undefined  隐式丢失  
obj.f1.call({...})→ 'x'          显式绑定  
new obj.f1()      → undefined    new 绑定,新对象上没有 name

(浏览器非严格模式下顶层 this 是 window,故为 'global';ESM/严格模式下为 undefined 或报错)

九、终极判断流程图

函数是箭头函数?  
├─ 是 → this = 定义时外层作用域的 this(向上查找,不可改变)  
└─ 否 ↓  
   用 new 调用? ──→ 是 → this = 新创建的对象  
   ↓ 否  
   用 call/apply/bind 调用? ──→ 是 → this = 指定的对象  
   ↓ 否                              (非严格下 null/undefined 会替换为 globalThis)  
   通过 obj.fn() 调用? ──→ 是 → this = obj(只看最后一个点)  
   ↓ 否  
   严格模式? ──→ 是 → this = undefined  
              └→ 否 → this = globalThis

十、最佳实践

1. 优先用箭头函数写回调,避免 this 丢失
2. 对象方法用简写语法 foo() {},不要用箭头函数(除非确实想要外层 this)
3. class 中默认用原型方法,需要传递为回调时才用箭头字段或构造器 bind
4. 全项目开启严格模式 / 使用 ESM,让 this 错误尽早暴露为 undefined 报错
5. TypeScript 用户:开启 noImplicitThis,并善用显式 this 参数:

   function handler(this: HTMLButtonElement, e: MouseEvent) { /* ... */ }  

6. 不确定时,打印 console.log(this) —— 比推理快十倍

问题现象
在使用animateTo方法实现循环动画的过程中，如果希望在每次动画播放时通过更新状态变量来刷新UI，可能会遇到UI无法动态响应更新的问题。例如，即使在事件中配置状态变量changeNum每次播放增加1，并设置动画循环播放3次，实际的UI显示仅更新一次，而onFinish的回调中changeNum仅记录1。

@Entry
@Component
struct AnimateToExample {
@State widthSize: number = 250;
@State heightSize: number = 100;
uiContext: UIContext | undefined = undefined;
@State changeNum: number = 0;
aboutToAppear() {
this.uiContext = this.getUIContext();
if (!this.uiContext) {
console.warn('no uiContext');
return;
}
}
playLrc() {
this.uiContext?.animateTo({
duration: 2000,
curve: Curve.EaseOut,
iterations: 3,
playMode: PlayMode.Normal,
onFinish: () => {
console.info('play end');
}
}, () => {
this.widthSize = 300;
this.heightSize = 60;
this.changeNum++;
});
}
build() {
Column() {
Button(this.changeNum.toString())
.width(this.widthSize)
.height(this.heightSize)
.margin(30)
.onClick(() => {
this.playLrc();
});
}.width('100%').margin({ top: 5 });
}
}
问题效果预览：

点击放大

背景知识
animateTo：提供animateTo接口来指定由于闭包代码导致的状态变化插入过渡动效。
关键帧动画 (keyframeAnimateTo)：在UIContext中提供keyframeAnimateTo接口来指定若干个关键帧状态，实现分段的动画。
解决方案
显示动画的参数iterations表示动画的执行次数，并不代表闭包函数里面的逻辑执行次数，所以问题代码中iterations:3并不会使得修改宽高动画执行3次，需要使用关键帧动画。
使用关键帧动画，可以分段执行动画逻辑。在动画结束后在onFinish回调中递归执行动画，从而实现预期效果。
@Entry
@Component
struct AnimateToExample {
@State widthSize: number = 250;
@State heightSize: number = 100;
uiContext: UIContext | undefined = undefined;
@State changeNum: number = 0;

aboutToAppear() {
this.uiContext = this.getUIContext();
};

playLrc() {
// 使用关键帧动画
this.uiContext?.keyframeAnimateTo({
iterations: 1,
onFinish: () => {
if (this.changeNum % 3 !== 0) {
this.playLrc();
}
}
}, [
{
// 第一段关键帧动画
duration: 800,
event: () => {
this.widthSize = 300;
this.heightSize = 60;
this.changeNum++;
}
},
// 第二段关键帧动画
{
duration: 500,
event: () => {
this.widthSize = 250;
this.heightSize = 100;
}
}
]);
}

build() {
Column() {
Button(this.changeNum.toString())
.width(this.widthSize)
.height(this.heightSize)
.margin(30)
.onClick(() => {
this.playLrc();
});
}.width('100%').margin({ top: 5 });
}
}
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问题现象
需要实现的底部弹窗可以设置一个最大高度。同时，实现的底部弹窗需要从下往上出现。

如果弹窗内部视图的高度超过了这个最大高度，弹窗内部的视图就以这个自定义最大高度进行滚动展示；
如果弹窗内部视图的高度没有超过这个最大高度，那么弹窗内部视图就完全展示；
背景知识
组件的constraintSize属性用于设置约束尺寸，组件布局时，进行尺寸范围限制。

对于组件的显示方式，转场主要通过transition属性配置转场参数，在组件插入和删除时显示过渡动效，主要用于容器组件中的子组件插入和删除时，提升用户体验。

解决方案
首先，通过使用容器组件的constraintSize属性对视图进行高度限制，constraintSize的优先级高于Width和Height，constraintSize里面的maxHeight小于Height时，就会滚动展示。接着，实现弹窗从底部向上显示，通过设置组件transition属性的转场参数。

示例代码如下：

@CustomDialog
struct CustomDialogExample {
// 最大可滚动区域高度
maxScrollHeight: number = 70;
// 视图是否显示，用于底部弹窗出现与消失时的动效处理
@Link showFlag: Visibility;
controller: CustomDialogController;
scroller: Scroller = new Scroller;
private arr: number[] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];

build() {
Column({ space: 5 }) {
RelativeContainer() {
Text('标题')
.fontSize(17)
.fontColor(Color.Black)
.fontWeight(FontWeight.Bold)
.alignRules({
middle: { anchor: 'container', align: HorizontalAlign.Center },
center: { anchor: 'container', align: VerticalAlign.Center }
});
}
.width('100%')
.height(48);

  Scroll(this.scroller) {  
    Column() {  
      ForEach(this.arr, (item: number) => {  
        Text(item.toString())  
          .width('90%')  
          .height(50)  
          .backgroundColor(0xFFFFFF)  
          .borderColor(Color.Black)  
          .fontSize(16)  
          .textAlign(TextAlign.Center);  
        Divider()  
          .vertical(false)  
          .strokeWidth(0.5)  
          .width('60%');  
      }, (item: string) => item);  
    }.width('100%');  
  }  
  .edgeEffect(EdgeEffect.Spring)  
  .scrollSnap({  
    snapAlign: ScrollSnapAlign.START,  
    snapPagination: 400,  
    enableSnapToStart: true,  
    enableSnapToEnd: true  
  })  
  // 使用constraintSize方法可以设置约束尺寸，组件布局时，进行尺寸范围限制  
  .constraintSize({ maxHeight: this.maxScrollHeight + '%' });  

}  
.justifyContent(FlexAlign.Center)  
.backgroundColor('#f5f5f5')  
.borderRadius({  
  topLeft: '16',  
  topRight: '16'  
})  
.visibility(this.showFlag)  
.transition(TransitionEffect.OPACITY.animation({ duration: 200 })  // 弹窗出现与消失的动效  
  .combine(TransitionEffect.translate({ y: 100 })),  
  (transitionIn: boolean) => {  
    if (!transitionIn) {  
      this.controller.close();  
    }  
  }  
);  

}
}

@Entry
@Component
struct CustomDialogDemo {
// 最大可滚动区域高度
@State maxScrollHeight: number = 70;
@State settingDialogShowFlag: Visibility = Visibility.Visible;
dialogController: CustomDialogController = new CustomDialogController({
builder: CustomDialogExample({
maxScrollHeight: this.maxScrollHeight,
showFlag: this.settingDialogShowFlag
}),
alignment: DialogAlignment.Bottom,
width: '100%',
// customStyle需要设置为true，否则底部弹窗出现的动效会有问题
customStyle: true,
autoCancel: true,
// 修改点击弹窗外部区域和返回操作时弹窗消失的方式，这里的处理会有一个动效。否则弹窗会以默认的方式消失
onWillDismiss: () => {
this.settingDialogShowFlag = Visibility.Hidden;
}
});

build() {
Column() {
Row({ space: 5 }) {
Row() {
Button('减10')
.onClick(() => {
this.maxScrollHeight -= 10;
});
};

    Row() {  
      Text(this.maxScrollHeight + '%')  
        .width('40%')  
        .height(45)  
        .textAlign(TextAlign.Center)  
        .backgroundColor('#f5f5f5');  
    };  

    Row() {  
      Button('加10')  
        .onClick(() => {  
          this.maxScrollHeight += 10;  
        });  
    };  
  };  

  Button('打开底部弹窗')  
    .onClick(() => {  
      this.settingDialogShowFlag = Visibility.Visible;  
      this.dialogController.open();  
    });  
}.justifyContent(FlexAlign.Center).width('100%').height('100%');  

}
}

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问题现象
第一次触发无限循环动画后，快速连续多次点击打断该无限循环动画，再次点击就无法看到动画了。

背景知识
animateTo：指定由于闭包代码导致的状态变化插入过渡动效。接口参数有两个，分别是value和event，其中value指定AnimateParam对象（包括时长、Curve等）event为动画的闭包函数，闭包内变量改变产生的属性动画将遵循相同的动画参数。

问题定位
对动画的执行机制进行排查，确认在动画打断过程中是否存在多次叠加的情况，从而导致动画未能正常显示。

分析结论
动画并未真正消失，而是在每次打断过程中被持续叠加，由于叠加的动画实例过多，彼此之间相互覆盖或干扰，导致在视觉上表现不明显，从而给人以动画消失的错觉。

修改结论
首先，应设置一个duration为0的动画，用于确保在每次动画被中断时，能够清除前一次的动画实例，避免动画叠加；该动画的属性值需设置为一个与上一次动画最终状态不同的指定值，以确保状态的更新和正确清除。随后，再创建一个用于实现所需初始动画效果的动画实例，以确保动画表现符合预期。

if (this.isRecording) {
// 设置一个duration为0的动画停掉上一次动画
this.getUIContext().animateTo({ duration: 0, iterations: 1, playMode: PlayMode.Normal }, () => {
// 这里的opacityValue不可以和上一次设置的终止0.1相同
this.opacityValue = 0.2;
});
this.isRecording = false;
// 再创建需要的动画
this.getUIContext().animateTo({ duration: 0, iterations: 1, playMode: PlayMode.Normal }, () => {
this.opacityValue = 1;
});
} else {
this.isRecording = true;
this.getUIContext().animateTo({ duration: 1500, iterations: -1, }, () => {
this.opacityValue = 0.1;
});
}
完整示例参考如下：

@Entry
@Component
struct Page {
@State opacityValue: number = 1;
@State isRecording: boolean = false;

build() {
Row() {
Column() {
Text(this.isRecording ? 'Hello World' : 'Welcome')
.fontSize(50)
.fontWeight(FontWeight.Bold)
.opacity(this.opacityValue)
.textAlign(TextAlign.Center)
.fontColor('#000')
.onClick(() => {
if (this.isRecording) {
// 设置一个duration为0的动画停掉上一次动画
this.getUIContext().animateTo({ duration: 0, iterations: 1, playMode: PlayMode.Normal }, () => {
// 这里的opacityValue不可以和上一次设置的终止0.1相同
this.opacityValue = 0.2;
});
this.isRecording = false;
// 再创建需要的动画
this.getUIContext().animateTo({ duration: 0, iterations: 1, playMode: PlayMode.Normal }, () => {
this.opacityValue = 1;
});
} else {
this.isRecording = true;
this.getUIContext().animateTo({ duration: 1500, iterations: -1, }, () => {
this.opacityValue = 0.1;
});
}
});
}
.width('100%');
}
.height('100%');
}
}
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问题现象
在List组件中，单个ListItem在同时设置拖拽功能与长按功能时，实际运行之后会产生冲突，如何解决单个ListItem拖拽功能和长按功能的冲突问题？

效果预览
点击放大

背景知识
支持统一拖拽提供了一种通过鼠标或手势触屏传递数据的机制，即从一个组件位置拖出数据并将其拖入到另一个组件位置，以触发响应。
长按手势通过长按屏幕触发长按手势事件。
由于拖拽事件和长按手势都需要通过长按来触发，因此这种组合手势类型会出现冲突，例如List组件中每个ListItem都设置单独的长按事件时，拖拽功能和长按手势功能就会出现冲突。
Grid网格容器，由“行”和“列”分割的单元格所组成，通过指定“项目”所在的单元格做出各种各样的布局。
滑动手势PanGesture，能够提供自定义拖拽事件的功能。
解决方案
由于在ListItem中设置单独的长按事件会与拖拽事件产生冲突，因此建议放弃List本身的拖拽事件，使用滑动手势PanGesture，自行实现拖拽过程的逻辑，然后再通过组合手势的功能，去实现其他的长按事件。
import curves from '@ohos.curves';

@Entry
@Component
struct Page {
// 元素数组
@State numbers: number[] = [];
// 多列
private str: string = '';
row: number = 4;
// 元素数组中最后一个元素的索引
@State lastIndex: number = 0;
@State dragItem: number = -1;
@State scaleItem: number = -1;
item: number = -1;
private dragRefOffsetX: number = 0;
private dragRefOffsetY: number = 0;
@State offsetX: number = 0;
@State offsetY: number = 0;
private FIX_VP_X: number = 108;
private FIX_VP_Y: number = 120;

aboutToAppear() {
for (let i = 1; i <= 36; i++) {
this.numbers.push(i);
}
this.lastIndex = this.numbers.length - 1;
// 多列
for (let i = 0; i < this.row; i++) {
this.str = this.str + '1fr ';
}
}

itemMove(index: number, newIndex: number): void {
console.info('index:' + index + ' newIndex:' + newIndex);
if (!this.isDraggable(newIndex)) {
return;
}
let tmp = this.numbers.splice(index, 1);
this.numbers.splice(newIndex, 0, tmp[0]);
}

// 向下滑
down(index: number): void {
if (!this.isDraggable(index + this.row)) {
return;
}
this.offsetY -= this.FIX_VP_Y;
this.dragRefOffsetY += this.FIX_VP_Y;
// 多列
this.itemMove(index, index + this.row);
}

// 向下滑(右下角为空)
down2(index: number): void {
if (!this.isDraggable(index + 3)) {
return;
}
this.offsetY -= this.FIX_VP_Y;
this.dragRefOffsetY += this.FIX_VP_Y;
this.itemMove(index, index + 3);
}

// 向上滑
up(index: number): void {
if (!this.isDraggable(index - this.row)) {
return;
}
this.offsetY += this.FIX_VP_Y;
this.dragRefOffsetY -= this.FIX_VP_Y;
this.itemMove(index, index - this.row);
}

// 向左滑
left(index: number): void {
if (!this.isDraggable(index - 1)) {
return;
}
this.offsetX += this.FIX_VP_X;
this.dragRefOffsetX -= this.FIX_VP_X;
this.itemMove(index, index - 1);
}

// 向右滑
right(index: number): void {
if (!this.isDraggable(index + 1)) {
return;
}
this.offsetX -= this.FIX_VP_X;
this.dragRefOffsetX += this.FIX_VP_X;
this.itemMove(index, index + 1);
}

// 向右下滑
lowerRight(index: number): void {
if (!this.isDraggable(index + this.row + 1)) {
return;
}
this.offsetX -= this.FIX_VP_X;
this.dragRefOffsetX += this.FIX_VP_X;
this.offsetY -= this.FIX_VP_Y;
this.dragRefOffsetY += this.FIX_VP_Y;
this.itemMove(index, index + this.row + 1);
}

// 向右上滑
upperRight(index: number): void {
if (!this.isDraggable(index - (this.row - 1))) {
return;
}
this.offsetX -= this.FIX_VP_X;
this.dragRefOffsetX += this.FIX_VP_X;
this.offsetY += this.FIX_VP_Y;
this.dragRefOffsetY -= this.FIX_VP_Y;
this.itemMove(index, index - (this.row - 1));
}

// 向左下滑
lowerLeft(index: number): void {
if (!this.isDraggable(index + (this.row - 1))) {
return;
}
this.offsetX += this.FIX_VP_X;
this.dragRefOffsetX -= this.FIX_VP_X;
this.offsetY -= this.FIX_VP_Y;
this.dragRefOffsetY += this.FIX_VP_Y;
this.itemMove(index, index + (this.row - 1));
}

// 向左上滑
upperLeft(index: number): void {
if (!this.isDraggable(index - (this.row + 1))) {
return;
}
this.offsetX += this.FIX_VP_X;
this.dragRefOffsetX -= this.FIX_VP_X;
this.offsetY += this.FIX_VP_Y;
this.dragRefOffsetY -= this.FIX_VP_Y;
this.itemMove(index, index - (this.row + 1));
}

// 通过元素的索引，控制对应元素是否能移动排序
isDraggable(index: number): boolean {
console.info(index: ${index});
return index > -1; // 恒成立，所有元素均可移动排序
}

build() {
Column() {
Grid() {
ForEach(this.numbers, (item: number) => {
GridItem() {
Text(item + '')
.fontSize(16)
.width('100%')
.textAlign(TextAlign.Center)
.height(100)
.borderRadius(10)
.backgroundColor(0xFFFFFF)
.shadow(this.scaleItem == item ? {
radius: 70,
color: '#15000000',
offsetX: 0,
offsetY: 0
} :
{
radius: 0,
color: '#15000000',
offsetX: 0,
offsetY: 0
})
.animation({ curve: Curve.Sharp, duration: 300 });
}
// 添加震动
.onTouch(() => {
})
.onAreaChange((oldVal, newVal) => {
// 多列
this.FIX_VP_X = Math.round(newVal.width as number);
this.FIX_VP_Y = Math.round(newVal.height as number);
console.info(oldVal:${JSON.stringify(oldVal)});
})
// 指定固定GridItem不响应事件
.hitTestBehavior(this.isDraggable(this.numbers.indexOf(item)) ? HitTestMode.Default : HitTestMode.None)
.scale({ x: this.scaleItem == item ? 1.05 : 1, y: this.scaleItem == item ? 1.05 : 1 })
.zIndex(this.dragItem == item ? 1 : 0)
.translate(this.dragItem == item ? { x: this.offsetX, y: this.offsetY } : { x: 0, y: 0 })
.padding(10)
.gesture(
GestureGroup(GestureMode.Sequence,
LongPressGesture({ repeat: true, duration: 50 })
.onAction((event?: GestureEvent) => {
console.info(event: ${event});
this.getUIContext().animateTo({ curve: Curve.Friction, duration: 300 }, () => {
this.scaleItem = item;
});
})
.onActionEnd(() => {
this.getUIContext().animateTo({ curve: Curve.Friction, duration: 300 }, () => {
this.scaleItem = -1;
});
}),
PanGesture({ fingers: 1, direction: null, distance: 0 })
.onActionStart(() => {
this.dragItem = item;
this.dragRefOffsetX = 0;
this.dragRefOffsetY = 0;
})
.onActionUpdate((event: GestureEvent) => {
this.offsetY = event.offsetY - this.dragRefOffsetY;
this.offsetX = event.offsetX - this.dragRefOffsetX;
console.info(移动过程中event.offsetY：${event.offsetY},
this.dragRefOffsetY: ${this.dragRefOffsetY}, this.offsetY: ${this.offsetY});
console.info(移动过程中event.offsetX：${event.offsetX},
this.dragRefOffsetX: ${this.dragRefOffsetX}, this.offsetX: ${this.offsetX});
this.getUIContext().animateTo({ curve: curves.interpolatingSpring(0, 1, 400, 38) }, () => {
let index = this.numbers.indexOf(this.dragItem);
console.info('index= ', index);
if (this.offsetY >= this.FIX_VP_Y / 2 &&
(this.offsetX <= this.FIX_VP_X / 2 && this.offsetX >= -this.FIX_VP_X / 2)
&& (index + this.row <= this.lastIndex)) {
// 向下滑
this.down(index);
} else if (this.offsetY <= -this.FIX_VP_Y / 2 &&
(this.offsetX <= this.FIX_VP_X / 2 && this.offsetX >= -this.FIX_VP_X / 2)
&& index - this.row >= 0) {
// 向上滑
this.up(index);
} else if (this.offsetX >= this.FIX_VP_X / 2 &&
(this.offsetY <= this.FIX_VP_Y / 2 && this.offsetY >= -this.FIX_VP_Y / 2)
&& !(((index - (this.row - 1)) % this.row == 0) || index == this.lastIndex)) {
// 向右滑
this.right(index);
} else if (this.offsetX <= -this.FIX_VP_X / 2 &&
(this.offsetY <= this.FIX_VP_Y / 2 && this.offsetY >= -this.FIX_VP_Y / 2)
&& !(index % this.row == 0)) {
// 向左滑
this.left(index);
} else if (this.offsetX >= this.FIX_VP_X / 2 && this.offsetY >= this.FIX_VP_Y / 2
&& ((index + this.row + 1 <= this.lastIndex && !((index - (this.row - 1)) % this.row == 0)) ||
!((index - (this.row - 1)) % this.row == 0))) {
// 向右下滑
this.lowerRight(index);
} else if (this.offsetX >= this.FIX_VP_X / 2 && this.offsetY <= -this.FIX_VP_Y / 2
&& !((index - this.row < 0) || ((index - (this.row - 1)) % this.row == 0))) {
// 向右上滑
this.upperRight(index);
} else if (this.offsetX <= -this.FIX_VP_X / 2 && this.offsetY >= this.FIX_VP_Y / 2
&& (!(index % this.row == 0) && (index + (this.row - 1) <= this.lastIndex))) {
// 向左下滑
this.lowerLeft(index);
} else if (this.offsetX <= -this.FIX_VP_X / 2 && this.offsetY <= -this.FIX_VP_Y / 2
&& !((index <= this.row - 1) || (index % this.row == 0))) {
// 向左上滑
this.upperLeft(index);
} else if (this.offsetX >= this.FIX_VP_X / 2 && this.offsetY >= this.FIX_VP_Y / 2
&& (index == this.lastIndex)) {
// 向右下滑(右下角为空)
this.down2(index);
}
});
})
.onActionEnd(() => {
this.getUIContext().animateTo({ curve: curves.interpolatingSpring(0, 1, 400, 38) }, () => {
this.dragItem = -1;
});
this.getUIContext().animateTo({
curve: curves.interpolatingSpring(14, 1, 170, 17), delay: 150
}, () => {
this.scaleItem = -1;
});
})
)
.onCancel(() => {
this.getUIContext().animateTo({ curve: curves.interpolatingSpring(0, 1, 400, 38) }, () => {
this.dragItem = -1;
});
this.getUIContext().animateTo({
curve: curves.interpolatingSpring(14, 1, 170, 17)
}, () => {
this.scaleItem = -1;
});
})
);
}, (item: number) => item.toString());
}
.width('90%')
.editMode(true)
.scrollBar(BarState.Off)
// 多列
.columnsTemplate(this.str);
}
.expandSafeArea([SafeAreaType.SYSTEM], [SafeAreaEdge.TOP, SafeAreaEdge.BOTTOM])
.width('100%').height('100%').backgroundColor('#f1f3f5').padding({ top: 5 });
}
}
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问题现象
在“我的”页面点击“跳转设置页”按钮跳转到设置页面，底部的TabBar导航栏仍然存在。

点击放大点击放大

主页面有“首页”、“我的”两个Tab页面，部分代码如下：

@Entry
@Component
struct TabsNavPage {
build() {
Tabs() {
TabContent() {
MinePage()
}
.tabBar(BottomTabBarStyle.of($r('sys.media.ohos_app_icon'), '我的'))

  TabContent() {  
    Text('首页')  
  }  
  .tabBar(BottomTabBarStyle.of($r('sys.media.ohos_app_icon'), '首页'))  
}  
.barPosition(BarPosition.End)  

}
}

@Component
struct MinePage {
@Provide('pathStack') pathStack: NavPathStack = new NavPathStack();

@Builder
PagesMap(name: string) {
if (name === 'Settings') {
Settings();
}
}

build() {
Navigation(this.pathStack) {
Row(){
Column() {
Button('跳转设置页')
.onClick(() => {
this.pathStack.pushPathByName('Settings', null);
})
}
}
}
.hideTitleBar(true)
.navDestination(this.PagesMap)
}
}

@Component
struct Settings {
@Consume('pathStack') pathStack: NavPathStack = new NavPathStack();

build() {
NavDestination() {
Button('返回')
.onClick(() => {
this.pathStack.pop();
});
}.title('设置')
}
}
效果预览
点击放大

背景知识
Navigation组件是路由导航的根视图容器，一般作为Page页面的根容器使用，其内部默认包含了标题栏、内容区和工具栏，其中内容区默认首页显示导航内容（Navigation的子组件）或非首页显示（NavDestination的子组件），首页和非首页通过路由进行切换。
@Provide装饰器和@Consume装饰器：应用于与后代组件的双向数据同步、状态数据在多个层级之间传递的场景。
解决方案
问题现象中是用Tab组件包裹Navigation组件，跳转Navigation子组件并不会影响到外层的Tab组件。

将Navigation组件作为根容器包括Tab组件，为保证子组件都共享一个NavPathStack实例，可以使用@Provide和@Consume装饰器将导航控制器对象NavPathStack传递给Tabs内的子组件使用。

@Entry
@Component
struct TabsNavPage {
// 使用@Provide将路由栈对象传递给TabContent内的组件
@Provide('pathStack') pathStack: NavPathStack = new NavPathStack();

@Builder
PagesMap(name: string) {
if (name === 'Settings') {
Settings();
}
}

build() {
// 使用Navigation包裹Tabs，Tabs子页使用同一个路由栈对象
Navigation(this.pathStack) {
Tabs() {
TabContent() {
MinePage();
}
.tabBar(BottomTabBarStyle.of($r('sys.media.ohos_app_icon'), '我的'))

    TabContent() {  
      Text('首页').fontColor('40fp');  
    }  
    .tabBar(BottomTabBarStyle.of($r('sys.media.ohos_app_icon'), '首页'))  
  }  
  .barPosition(BarPosition.End);  
}  
.hideTitleBar(true)  
.navDestination(this.PagesMap)  

}
}

@Component
struct MinePage {
// 获取Navigation的路由栈对象
@Consume('pathStack') pathStack: NavPathStack;

build() {
Column() {
Button('跳转设置页')
.onClick(() => {
this.pathStack.pushPathByName('Settings', null);
});
};
}
}

@Component
struct Settings {
@Consume('pathStack') pathStack: NavPathStack = new NavPathStack();

build() {
NavDestination() {
Button('返回')
.onClick(() => {
this.pathStack.pop();
});
}.title('设置')
}
}
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logcat日志如下：

Unresolved exception class when finding catch block: net.lingala.zip4j.exception.ZipException
2026-08-28 15:40:18.591 29792-30261 AndroidRuntime com.gdxinyue.newusmp
E FATAL EXCEPTION: Thread-10
Process: com.gdxinyue.newusmp, PID: 29792
java.lang.NullPointerException: Attempt to read from null array
at io.dcloud.feature.pdr.RuntimeFeatureImpl$a.run

参考博客：https://blog.csdn.net/qq_32058147/article/details/155034674

在Android Stadio主项目的 build.gradle > dependencies中增加以下依赖：

dependencies {
implementation 'net.lingala.zip4j:zip4j:2.11.5'
}

创建uni-app项目时选择uni-starter模板，我发现其中pages/list/search/search.vue中的“搜索联想”部分代码<uni-list-item>的:title="item.name"可能写错了，应该改为:title="item.title"，具体代码如下：
<!-- 搜索联想 -->
<view class="search-associative" v-if="associativeShow">
<uni-list>
<!-- :title="item.name"可能写错了，文章表没有name字段，associativeList只是获取_id、title字段！ -->
<!-- <uni-list-item v-for="(item,index) in associativeList" :key="item._id" :ellipsis="1" :title="item.name" @click="associativeClick(item)" show-extra-icon
clickable :extra-icon="{size:18,color:iconColor,type:'search'}" >
</uni-list-item> -->

            <!-- 正确改为:title="item.title"，在搜索框输入文章记录的标题子串时，会显示篇文章的标题 -->  
            <uni-list-item  v-for="(item,index) in associativeList" :key="item._id" :ellipsis="1" :title="item.title" @click="associativeClick(item)" show-extra-icon  
             clickable :extra-icon="{size:18,color:iconColor,type:'search'}" >  
            </uni-list-item>  
        </uni-list>  
    </view>  

这个搜索联想的功能应该是在搜索框输入文章记录标题的子串时，提示有没有这篇文章，若存在，则显示所有标题带有此子串的文章标题列表，这样就可以直接点击找到此文章，因为模板的代码写错了"item.name"，导致完全没有提示，希望可以改正过来。

问题现象
如何实现手指长按组件时，组件能够跟随手指拖动，手指抬起后，组件贴边停靠的效果。

背景知识
onTouch是用于处理触摸事件的组件属性，支持TouchType.Down（按下）、TouchType.Move（移动）、TouchType.Up（抬起），用于多模交互场景（如拖拽、点击、滑动等）。
animateTo是用于实现动画效果的核心函数，支持平滑过渡、弹性动画、曲线控制等。
解决方案
为实现上述功能，可通过如下步骤实现：

通过组件的触摸事件onTouch，其中使用TouchType.Down记录手指按下时的初始坐标，使用TouchType.Move获取手指移动时的位置信息，通过获取的位置信息修改组件的position属性实现元素的拖拽功能：
// 指针按下事件：记录初始坐标
case TouchType.Down: {
this.windowStartX = event.touches[0].windowX;
this.windowStartY = event.touches[0].windowY;
break;
}
case TouchType.Move: {
const windowX: number = event.touches[0].windowX;
const windowY: number = event.touches[0].windowY;
// 左边距吸附时：更新左边缘位置
if (this.edge.left !== undefined) {
this.edge.left = this.edge.left as number + (windowX - this.windowStartX);
}
// 右边距吸附时：更新右边缘位置
else {
this.edge.right = this.edge.right as number - (windowX - this.windowStartX);
}
// 更新顶部位置
this.edge.top = this.edge.top as number + (windowY - this.windowStartY);
// 更新起始坐标用于下次计算
this.windowStartX = windowX;
this.windowStartY = windowY;
break;
}
再通过TouchType.Up（手指抬起），对比手指抬起时组件所处位置，与容器组件的中心位置，判断出需要向哪边进行贴边操作，或与容器元素宽度进行对比，判断元素是否超出容器，选择将组件position属性的left或right设置为undefined并将其对立方向设置为0，且位置的调整设置于animateTo中，实现将元素从容器内部或容器外部缓慢调整至容器边缘，从而实现组件拖拽后的贴边效果：
case TouchType.Up: {
// 计算悬浮窗中心点在父组件中的水平坐标
let centerX: number;
if (this.edge.left !== undefined) {
centerX = this.edge.left as number + this.floatWindowWidth / 2;
} else {
centerX = this.containerWidth - (this.edge.right as number) - this.floatWindowWidth / 2;
}
// 使用阻尼动画实现吸附效果
this.uiContext.animateTo({ curve: curves.springMotion() }, () => {
// 获取屏幕宽度
let width = this.uiContext.px2vp(display.getDefaultDisplaySync().width);
// 启用吸附功能时
if (this.openAdsorb) {
// 根据中心点位置决定吸附方向
if (centerX > (this.containerWidth / 2)) {
// 右侧吸附
this.edge.right = this.pagePadding;
this.edge.left = undefined;
} else {
// 左侧吸附
this.edge.right = undefined;
this.edge.left = this.pagePadding;
}
} else {
// 检查是否超出左侧屏幕
let overflowLeft = this.edge.right! > width - this.floatWindowWidth;
// 检查是否超出右侧屏幕
let overflowRight = this.edge.right! < 0;
// 处理超出屏幕边界的情况
if (overflowLeft) { // 超出左边屏幕
this.edge.left = undefined;
this.edge.right = width - this.floatWindowWidth;
} else if (overflowRight) { // 超出右边屏幕
this.edge.right = this.pagePadding;
this.edge.left = undefined;
}
}
})
break;
}
完整实现如下：

import { curves, display } from '@kit.ArkUI';

@Component
export struct FloatWindowView {
@State edge: Edges = { top: 200, left: 0 };
@Link containerWidth: number;
@Link containerHeight: number;
private windowStartX: number = 0;
private windowStartY: number = 0;
// 是否启用吸附功能
openAdsorb: boolean = true;
@Prop pagePadding: number = 0; // 页面内容内边距，用于悬浮窗位置计算
@State floatWindowWidth: number = 100; // 悬浮窗宽度
@State floatWindowHeight: number = 50; // 悬浮窗高度
uiContext: UIContext = this.getUIContext();

// 触摸回调，实现悬浮窗跟手拖拽和贴边吸附动画
onTouchEvent(event: TouchEvent): void {
switch (event.type) {
// 指针按下事件：记录初始坐标
case TouchType.Down: {
this.windowStartX = event.touches[0].windowX;
this.windowStartY = event.touches[0].windowY;
break;
}
case TouchType.Move: {
const windowX: number = event.touches[0].windowX;
const windowY: number = event.touches[0].windowY;
// 左边距吸附时：更新左边缘位置
if (this.edge.left !== undefined) {
this.edge.left = this.edge.left as number + (windowX - this.windowStartX);
}
// 右边距吸附时：更新右边缘位置
else {
this.edge.right = this.edge.right as number - (windowX - this.windowStartX);
}
// 更新顶部位置
this.edge.top = this.edge.top as number + (windowY - this.windowStartY);
// 更新起始坐标用于下次计算
this.windowStartX = windowX;
this.windowStartY = windowY;
break;
}
// 指针抬起事件：实现吸附动画和边界限制
case TouchType.Up: {
// 计算悬浮窗中心点在父组件中的水平坐标
let centerX: number;
if (this.edge.left !== undefined) {
centerX = this.edge.left as number + this.floatWindowWidth / 2;
} else {
centerX = this.containerWidth - (this.edge.right as number) - this.floatWindowWidth / 2;
}
// 使用阻尼动画实现吸附效果
this.uiContext.animateTo({ curve: curves.springMotion() }, () => {
// 获取屏幕宽度
let width = this.uiContext.px2vp(display.getDefaultDisplaySync().width);
// 启用吸附功能时
if (this.openAdsorb) {
// 根据中心点位置决定吸附方向
if (centerX > (this.containerWidth / 2)) {
// 右侧吸附
this.edge.right = this.pagePadding;
this.edge.left = undefined;
} else {
// 左侧吸附
this.edge.right = undefined;
this.edge.left = this.pagePadding;
}
} else {
// 检查是否超出左侧屏幕
let overflowLeft = this.edge.right! > width - this.floatWindowWidth;
// 检查是否超出右侧屏幕
let overflowRight = this.edge.right! < 0;
// 处理超出屏幕边界的情况
if (overflowLeft) { // 超出左边屏幕
this.edge.left = undefined;
this.edge.right = width - this.floatWindowWidth;
} else if (overflowRight) { // 超出右边屏幕
this.edge.right = this.pagePadding;
this.edge.left = undefined;
}
}
})
break;
}
default: {
break;
}
}
}

build() {
Column() {
}
.clip(true)
.backgroundColor('#0A59F7')
.width(this.floatWindowWidth)
.height(this.floatWindowHeight)
.position(this.edge)
.onTouch((event: TouchEvent) => {
this.onTouchEvent(event);
})
}
}

@Entry
@Component
struct Index {
// 父组件宽度
@State containerWidth: number = 0;
// 父组件高度
@State containerHeight: number = 0;

build() {
Stack() {
FloatWindowView({
containerWidth: this.containerWidth, // 传递父容器宽度
containerHeight: this.containerHeight, // 传递父容器高度
})
.width('100%')
}
// 设置外层Stack容器的尺寸
.height('100%')
.width('100%')

.onAreaChange((oldValue: Area, newValue: Area) => {  
  // 记录父组件的宽高  
  if (oldValue.width !== newValue.width) {  
    this.containerWidth = newValue.width as number;  
  }  

  if (oldValue.height !== newValue.height) {  
    this.containerHeight = newValue.height as number;  
  }  
})  

}
}
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